| (19) |
 |
|
(11) |
EP 0 390 536 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
24.07.1991 Bulletin 1991/30 |
| (43) |
Date of publication A2: |
|
03.10.1990 Bulletin 1990/40 |
| (22) |
Date of filing: 28.03.1990 |
|
|
| (84) |
Designated Contracting States: |
|
DE ES FR GB IT NL SE |
| (30) |
Priority: |
28.03.1989 ZA 892253
21.08.1989 ZA 896347
15.01.1990 ZA 900250
|
| (71) |
Applicant: PLASCON TECHNOLOGIES (PROPRIETARY) LIMITED |
|
Bedfordview (ZA) |
|
| (72) |
Inventor: |
|
- Symons, Michael Windsor
Pretoria,
Transvaal (ZA)
|
| (74) |
Representative: Ablewhite, Alan James et al |
|
MARKS & CLERK,
57/60 Lincoln's Inn Fields
London WC2A 3LS
London WC2A 3LS (GB) |
|
| |
|
| (54) |
Method of making a composite structure |
(57) A method of making a composite structure (10) from two first sheets (12, 14) of a
natural fibre material such as paper and a second corrugated sheet (16) of a natural
fibre material such as paper, the second sheet (16) being sandwiched between the two
first sheets (12, 14), includes the steps of impregnating the sheets (12, 14, 16)
with a liquid composition comprising a thermosetting resin such as a phenolic resin,
an extending liquid for the thermosetting resin and a catalyst for the thermosetting
resin, locating the second sheet (16) between the two first sheets (12, 14) and polymerising
the thermosetting resin to join the second sheet (16) to the two first sheets (12,
14) to form the composite structure (10). The composite structure (10) is of use in
the building and packaging industry.